1/2x^2-20

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Solution for 1/2x^2-20 equation: 


x in (-oo:+oo)

(1/2)*x^2-20 = 0

1/2*x^2 = 20 // : 1/2

x^2 = 40

x^2 = 40 // ^ 1/2

abs(x) = 2*10^(1/2)

x = 2*10^(1/2) or x = -(2*10^(1/2))

x in { 2*10^(1/2), -(2*10^(1/2)) }

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